Electric ozone generator



Oct. 28, 194*.

J. M. DAILY ELECTRIC OZONE GENERATOR Filed March 5, 1936 3 Sheets-Sheet l ocuzs, 1941. J, M DAILY I 2,260,831

ELECTRIC OZONE GENERATOR Filed March 5, 1936 3 Sheets-Sheet 2 Mill/1401127 Q JZUGTIZYOF 0a. 28, 1941. J. M. 'DMLY 2,260,831

ELECTRIC OZONE GENERATOR Filed March 5. 1936 3 Sheets-Sheet 3 ozone by a discharge from the trode to the grounded one.

Patented Oct. 28, 1941 UNITED STATES PATEN -orgies ELECTRIC OZONE GENERATOR James M. Daily, Chicago, Ill., assignor to American Ozone Company, Chicago, 111., a corporation of Illinois Application March 5, 1936, Serial No. 67,222

14 Claims. (01. 204-322) The present invention relates'generally to ozone generators. More particularly theinvention relates to that type of ozone-generator which operates to produce or generate ozone or ozonous air by way of an electrical discharge and comspaced apart to form therebetween a combined air [passage and spark gap for the formation of In practide it has been found that in an ozone generator of this type'the current which is supplied to the high tension electrode sometimes flashes or arcs around the margin of the adjacent dielectric plate. This flashing or arcing of the current is attributable to the accumulation of dust or moisture on the margin of the dielectric plate which fits against the inner face of the high tension electrode, and causes local heating which unit. It has also been found in practice that during operation of an ozone generator of'the type under consideration small arcs reach out from the margins of the high tensionelectrode "before the flash or arc-over point is reached and that these small reaching. arcs becausethey are the wrong type of electrical discharge produce an inferior grade of ozone and thus reduce materially the efficiency of the generator. I

C One object of the present invention is to pro vide an electric ozone generator of the type-under consideration which is more eflicient and practi cal than previously designed generators of the same'general'character by reason of the fact that the high tension electrode is surrounded on the edges thereof and also its back face with insulatingor dielectric material which eliminates the formation of the so-called' reaching arcs and at the same time prevents the accumulation of moisture and dust on the margin of the adjacent dielectric plate and the resultant flash or areovers which tend to crack or injure the plate and result in ashorting of the generating unit. Another object of the invention isto provide I an ozone generator of the aforementioned type high tension elecv theresultant' impure or adulterated ozone and ozone which is produced between the dielectric plates as the result of the discharge of current from the high tension electrodes to the grounded ones.

Another object of the invention is to provide an ozone generator of the last mentioned character in which the high tension electrodes and the dielectric plates of each generating unit consist of sector-shaped sections whichare annularly arranged with respect to the central ozone receiving chamber.

A further object of the invention is to provide an ozone generator which consists of a plurality of serially arranged, generating units and embodies novel means for cooling the grounded electrodes and supplying current to the-high tension electrodes. I

A still further object of the invention is-to provide an electric ozone generator of the plural unit type which is extremely efiicient in operation and may be manufactured at a low and reasonable cost and in which the various parts thereof are compactly arranged and readily accessible Other objects of the invention and the various advantages and characteristics 'of the present ozone generator will be apparent from a consideration of the following detailed description.-

The invention consists in the several novel features which are hereinafter set forth and are more particularly defined by claims at the conclusion hereof. I 1 1 In the drawings which accompany and form a part of this specification or disclosure and in which like numerals of reference denote corresponding parts throughout the several views:

, Figure 1 is a horizontalsection of an electric ozone generator embodying the invention;

Figure 2' is a vertical section taken on the line 22 of Figure 1 and illustrating in detail the arrangement and character of the generating units; V

Figure 3 is an'enlarged horizontal sectional view showing the construction and character? of the high tension electrodes and the dielectric plates of the generating units; r a

Figures 4 and 5 are vertical sectional views taken respectively on lines 44 and 5-5 of Figure 3;

Figure 6 is an enlarged sectional view showing the manner of mounting and constructing. the

sector-shaped sections which form the high ten- Figure 10 is a sectional view taken on the line 0 of Figure 3 and showing in detail the construction and character of the means for circulating a cooling medium through the hollow grounded electrodes of the units.

The ozone generator which is shown in the drawings and constitutes the preferred embodiment of the invention comprises a casing H and a series of ozone generating units l2. The casing is cylindrical, as shown in Figure 1, and consists of a circular base I3, a cylindrical side wall l4 and a concavo convex top l5. The base is slightly greater in diameter than the side wall l4 and is formed of non-oxidizable metal or any other suitable material. The casing side wall l4 embodies as a part thereof a door l4 and has an out-turned flange l8 at the bottom thereof and an out-turned flange IT at its upper end. The flange I6 overlies the margin of the base l3 and is connected to the latter by means of bolts H! which extend through the flange and into the base. A ring-shaped gasket l3 is interposed and forms a seal between the adjacent faces of the flange I6 and the base |3. The top 55 closes the upper end of the side wall l4 and embodies an outwardly extending marginal flange 23 which overlies the flange l1 and is secured to the latter by means of bolts 2|. A ring-shaped gasket 22 is interposed between the flanges H and 20 and forms an airtight seal between the upper end of the side wall M of the casing and the top I5. The door l4 permits access to be had to the interior of the casing. It embodies an out-turned bottom flange 23 and an out-turned top flange 24. It is removably secured in place by means of a set of bolts 25 and a set of bolts 26. The bolts 25 extend through the flange 23 into the casing base 3. The bolts 26 extend through the flange 24 and are carried by the flange 28 on the top I5. In addition to the bottom and top flanges 23 and 24 the door I4 embodies out-turned side flanges 27. These flanges, as shown in Figure l, are positioned in opposed relation with respect to out-turned flanges 28 on the side margins of the casing side wall proper. Sealing strips 23 are interposed between the flanges 21 and 23 so as to render the casing airtight when the door l4 is in place. When access to the interior is de sired it is only necessary to remove the bolts 25 and 2B and then remove the door M Air under pressure is supplied into the casing II for ozone forming purposes by means of a pipe 33 and a duct 3|. The duct, as shown in Figures 1 and 2, extends horizontally and radially through the margin of the base I3 and has an upturned discharge end 32 which is located in close proximity to the side wall l4 of the casing The pipe 30 leads from a compressor or any other source of compressed air and fits within the outer end of the duct.

The generating units |2 serve, as hereinafter described, to form or convert the air within the casing into ozone. They are disposed in superposed relation within the casing and each comprises a high tension electrode 33 and a grounded electrode 34. The grounded electrodes 34 are in the form of hollow disks and are held in vertically spaced relation by means of wedgeshaped insulating pieces 35. They are mounted on a rotatable carrier 36 on the base |3 of the generator casing and comprise top walls 31 and bottom walls 38. The central portions of the electrodes 34 have circular apertures 39. These apertures are "coaxial, as shown in Figure 2 of the drawings, and form a vertically extending central ozone receiving chamber 40. The top walls 31 of the grounded electrodes are spaced from the bottom walls 38 by means of outer side walls 4| and inner side walls 42. The outer side walls are in the form of circular pieces of wire and fit between and are soldered to the outer margins of the top and bottom walls of the electrodes 34. The inner side walls 39, like the outer side walls 4|, are formed of circular pieces of wire. They extend between and are soldered to the inner margins of the top and bottom walls 37 and 38 of the electrodes and form with said top and bottom walls and the outer side walls 4| ring-shaped compartments 43. The rotatable carrier 36 consists of a pair of superposed rings 44 and 45. The ring 44 is cemented or otherwise fixedly secured to the top face of the base l3 of the casing and has a circular groove 46 on the top face thereof. The ring 45 is the same in size as the ring 44 and has a circular groove 41 in its under face. This groove 47 overlies the groove 46 and the two grooves form an annular or circular race for a series of balls 48 whereby the top ring, that is the ring 45, is rotatable relatively to the bottom ring. The hollow grounded electrodes 34 are mounted on and coaxially arranged with respect to the top ring 45 and are rotatable with the ring. The wedge-shaped insulating pieces 35 extend radially outwards from the ozone receiving or collecting chamber 40 and are spaced equidistantly apart. Preferably there are five pieces beneath each grounded electrode and the five pieces of each set are vertically aligned with the pieces of the other sets. The lowermost pieces 35 rest on the ring 45 of the rotatable carrier 38. The spaces between the insulating pieces 35 form wedge-shaped passageways which lead from the outer edgesof the electrodes 34 to the ozone receiving chamber 40. The lower end of the chamber is closedby the base |3 of the generator casing I I and the upper end of the chamber is closed by means of a circular plate 49. This plate, as shown in Figure 2, rests on the uppermost grounded electrode 34 and is secured in place by means of bolts 50.

A cooling medium such as water is circulated through the ring-shape compartments 43 for electrode cooling purposes by means of a supply tube 5| and a discharge tube 52. These two tubes, as shown in Figure 10 of the drawings, extend upwardly from thebase |3 of the generator casing and are arranged in side by side relation. The supply tube 5| extends through holes 53 in certain of the insulating pieces 35 and through holes 54 in the top and bottom walls of theelectrodes 34 and receives the cooling medium from a pipe 55. The latter extends upwardly through the base |3 of the generator casing and embodies a pipe nipple 58 and a union 5'! between it and the pipe nipple. The union is located within the casing and the pipe nipple extends into the outer end of a horizontal radially extending duct 58 in the top ring 45 of the rotatable carrier 36. The lower end of the supply tube 5| extends downwardly into the top ring 45 of the carrier and intersects and communicates with the inner end of the duct 58. The cooling fluid flows through the pipe 55 to the duct 58 and then passes upwardly through the tube 5|. Holes 59 are formed in the tube 5| and permit the cooling medium to flow outwardly from the tube into the compartments 43. The holes 53' and 54 through which the tube 5| extends are aligned with one another and are suitably packed so as to prevent leakage of the cooling medium from the electrodes v34.

outer endof the duct 62.

As shown in'Figure '10, the upper end of the tube terminates within the compartment 43 of the grounded electrode. The'cooling medium after being introduced into the compartments 43 the holes 60 and BI and serves toconduct the cooling medium downwards from the compartment in the upper or topmost electrode 34 to a horizontalradially extending duct 62 in the top ring'45 of the rotatable carrier 36. From this last mentioned duct the cooling medium is discharged by a' pipe 63 which extends through the base I3 of the generator casing and embodies at its inlet end a union 64 and a nipple 65. The union is connected to one end of the nipple 65 and the other endof the nipple extends into the The unions 51 and 64 are'located adjacent to the door I4 of the easing side wall and. when uncoupled from their respective nipples permit the top ring 45 of the rotatable carrier36 together with the generating units II to rotate. In order to cause the cooling medium to flow or circulate completely around the compartments 43 prior to discharge via the tube'52, strips 66 are provided. These strips, as shown in Figure 1, extend between the inner and outer side walls 4| and 42 of the grounded electrodes and are arranged so that the holes 54 are on one side thereof and the holes 6| are on their other side. The top and bottom portions of the strips 66 are soldered or otherwise fixed or secured to the top and bottom walls of the elechigh tension electrodes and the grounded electrodes-34 and this discharge results in the formation of ozone from the air in the wedge-shaped passageways between the insulating pieces 35. The high tension electrode of each generating unit I2 is of sectional design and consists of five sector-shaped sections 61. These sections are associated respectively with the wedge-shaped passageways between the insulating pieces 35.

Associated with each sector-shaped section 61 are a pair of dielectric plates 68 and 69, a pair of floating electrodes 10 and H, a second pair of dielectric plates 12 and 13, and a pair of conductor plates 14 and I5. The dielectric Plates 68 and 69 are formed of glass or any other suitable dielectric material and correspond in shape to the sector-shaped sections 61 although they are larger than the latter, as shown in the drawings. The dielectric plates 68 fit against the top faces of the sections 61 of the high tension electrodes 33 and are arranged so that their side, outer and innermargins project beyond the corresponding margins of said sections 61. The dielectric plates 69 fit against the bottom faces of the sections 61 and are thesame in size as the plate 68. The 75 plates 68 and 69 are secured togetheriandare in lapped or abutting relation with respect to the sector-shaped sections. 61 of the high tension electrodes by means of strips 16 of insulating'tape. As shown in Figure 7, these strips surround the edges of the sections 61 and fit between the marginsof the dielectric plates 68 and69. The strips are substantially the same in thickness as the electrode sections 61 and have coatings (not shown) of varnish or a sealing compound whereby they are bonded or connectedto the adjacent or abutting marginal portions of the dielectric plates 68 and 69. By employing the strips 16 of. insulating tape the electrode sections 61 are sealed and flash or arc-overs around the margins or edges of the dielectric plates 68 and 69 and the resultant damage or injury of the dielectric plates is avoided. The strips 16 prevent moisture and dirt from accumulating on the inner faces of the margins of the dielectric plates and thus leakage of current is avoided. Preferably insulating tape having much greater insulating strength than the voltage of the current which is supplied to the high tension electrodes is used to form the strips 16 and hence as a result the so-called reaching arcs are eliminated. By eliminating the reaching arcs the ozone which is produced by the generator is unadulterated. By eliminating flash or arc-overs around the margins of the dielectric plates breakage of the plates 68 and 69 or the possibility of the plates cracking or becoming injured is reduced and the life of the generatoriis thus increased. As shown in Figures 6 and 7, the width of the strips 16 is several times greater than the thickness of the dielectric plates 68 and 69. As a result of this and because of the insulating strength of the strips there is no possibility of a flash-over even though after repeated use of the generator, a metallic deposit occurs between the edges of the sections 61 and the inner edges of the strips as the result of disintegration of the metal of said sections. By having the strips 16 extend inwardly from the edges of the dielectric plates 68 and 69 the frame; formation which is formed by the strips serves'eifectively and efiiciently to maintain the sections 6'! in sub-; stantially centered relation with respect to such dielectric plates even though slight slippage of the sections should occur with respect to the plates as the result of vibration due to the electrical ozone producing discharge. By having the dielectric plates 68 and 69 preformed and of uni-v form thickness throughout as shown in the draw-. ings, the sections 6'! are uniformly spaced with respect to the outer faces of such dielectric plates and hence a uniform disposition of the electrical discharge is maintained between the. high tension electrodes and the grounded electrodes 34 during operation of the generator. The floating elec trodes 19 are wedge or sector-shaped. They are formed of aluminum or like material and are positioned equidistantly between the dielectric plates 68 and 12. U-shaped strips 11 and 18 of insulating tape serve to space the floating electrodes 10 above the dielectric plates 68. The strips 11 .ex--. tend around and lengthwise of the side margins of the dielectric plates 68 and 69. The strips-18 fit around the strips 11 and the upperportions plates 69 and the dielectric plates 13. They are formed of aluminum or like material and are held in spaced relation with respect to the dielectric plates 69 by the bottom portions of the U-shaped strips Tl and 18 of insulating tape which, as hereinbefore described, extend around the side margins of the dielectric plates 68 and 69. The dielectric plates 12 are wedge or sector-shaped and underlie the bottom walls 38 of the hollow grounded electrodes 34. They are formed of glass or any other suitable material and are supported in spaced relation above the high tension electrode sections 6! by means of U-shaped strips 19 and 80 of insulating tape. The strips 19 extend around and lengthwise of the margins of the floating electrodes 70 and H and the strips 88 extend around the strips 19, as shown in Figures 5, 6 and 8. The upper portions of the strips 80 underlie and are secured to the bottom faces of the side margins of the dielectric plates 12. The dielectric plates 13 are formed of the same material as the plates 12. They are the same in size and shape and are spaced from the floating electrodes H by the bottom portions of the strips 19 and 80 of insulating tape. The conductor plates 14 are wedge or sector-shaped and fit between the dielectric plates 72 and the bottom walls 38 of the grounded water cooled electrodes 34. They are formed of non-oxidizable metal such as aluminum and are cemented or otherwise bonded or secured to the top faces of the dielectric plates 12. The conductor plates 15 are the same in size and shape as the conductor plates 14 and are formed of the same material. They fit between the dielectric plates 13 and the top walls 31 of the grounded electrodes and are bonded or cemented to the bottom faces of the plates 73. The floating electrodes and H serve to increase the ozone forming capacity of the generator and the spaces above and below them constitute combined air passages and spark gaps and these are closed at the sides thereof and are open at their ends and lead from the outer portion of the casing interior to the ozone collecting chamber 48. During operation of the generator air under pressure enters the casing by way of the pipe 38 and flows through the combined air passages and spark gaps in the direction of the ozone collecting chamber 48. When current is supplied to the sector-shaped sections 61 which constitute the high tension electrodes of the generating units I2, it passes in the form of a silent discharge through the dielectric plates 68 and 69 across the combined air passages and spark gaps between the last mentioned dielectric plates and the floating electrodes 18 and H and then after passing through the floating electrodes, flows across the combined air passages and spark gaps between the floating electrodes and the dielectric plates 12 and 73 and thence through the dielectric plates 12 and 13 to the conductor plates '14 and 75 and the grounded electrodes 34. As the result of the silent discharge the air in the combined air passages and spark gaps is formed into ozone. The latter flows into the chamber 48 and thence through a pipe 8! to the point of consumption or use. As shown in Figure 2, the pipe 8| extends through the base I3 of the casing and communicates with the lower end of the chamber 48. Each high tension electrode section 81 and the dielectric plates and floating electrodes which are associated therewith constitute an independent, wedge-shaped, unitary assembly which fits within and is removable from one of the passageways between the wedge-shaped insulating pieces 35. The outer ends of the dielectric plates 12 and 13 project outwardly beyond the outer side walls 4| of the grounded electrodes 34 and provide handles whereby the assemblies may be readily withdrawn from the aforementioned passageways between the pieces 35. When the unions 5'! and 64 are uncoupled so as to release the ring 45 of the rotatable carrier 36 the assemblies may by rotation of the generating units be brought successively into range of the casing door M High voltage current is supplied to the high tension electrodes 33 of the superposed generating units l 2 by means of a vertically extending metal rod 82, a conductor 83, and a high tension lead 84. The conductor 83 extends horizontally and is mounted in a tube of insulating material. This tube, as shown in Figure 2, fits in a radially extending bore'85 in the base l3 of the generator casing I I. The high tension lead 84 is connected to the outer end of the conductor 83 and is adapted for connection to a transformer or like source of high voltage. current. The rod 82 is disposed in and extends through the ozone collecting chamber 48. The upper end of the rod terminates beneath the circular plate 49 on the top water cooled grounded electrode 34. The lower end of the rod extends into the inner end of the tube 85 and contacts with the inner end of the conductor 83. Mounted on and rotatable about the rod are vertically spaced pairs of metal disks 87. Sleeves 88 of any suitable material fit between and serve to space apart the pairs of disks 81. As shown in Figure 4 of the drawings there is one pair of disks 8! for each high tension electrode 33 and the sleeves 88 are mounted on the rod 82 and hold the pairs of disks in horizontal alignment or registry with the sections 61 of the high tension electrodes. The disks are formed of spring metal and are adapted to receive and grip frictionally conductor tabs 89 on the inner ends of the electrode sections 67, as shown in Figures 1, 3 and 4. The tabs are preferably formed integrally with the sections 6'! and project towards the central portion of the ozone collecting chamber 48. When the'generating units I2 are rotated the conductor disks 8'! turn with the tabs 89 and revolve about the rod 82. When the assemblies of high tension electrode sections, floating electrodes, and dielectric plates are removed from the passageways between the insulating pieces 35, the tabs 89 slide out of contact with the conductor disks 8']. When the assemblies are inserted back into the passageways the tabs spread apart the disks and force their way therebetween.

When the ozone generator is in operation the air under pressure which is introduced into the generator casing H flows in the direction of the collecting chamber 48 through the combined air passages and spark gaps above and below the floating standards 10 and H. As the air travels through these combined passages and spark gaps it is subjected to a silent discharge and is formed into ozone. The ozone is forced by the inward flow of new air into the combined air passages and spark gaps to enter the chamber 40 and flows from the chamber through the pipe 8| to the point of ozone consumption or use. The silent discharge across the combined air passages and spark gaps results from the supply of current through the high tension lead 84, the conductor 83, the rod 82, and the conductor disks 8! to the high tension electrode sections 61, and then flow or passage of current from the high tension electrodes to the water cooled electrodes 34 which are grounded by way of the pipes 55 and 63. During operation of the generator, the grounded "compartments 43.

electrodes arecooledas the result of the flow of the cooling medium through the ring-shaped This cooling medium, as here- 'inbefore pointed out, flows upwards through the tube'5l and thence into the compartments 43 via "the holes 59. After circulating or flowing around 'the Compartments within the grounded electrodes the medium flows upwards through the holes 60 and BI and then passes downwards through the tube 52'to the discharge pipe 63. When it is desired to remove one of the assemblies which comprise the high tension electrode sections 61 the dielectric plates 68, 69, 12, 13, and the floating 'electrodes 10 and 1|, the door M of the casing is removed. Thereafter the unions and 64 are uncoupled and the generating units are turned or swung until the assembly which is .to be removed or replaced is disposed opposite .to the doorway. By gripping the outer margins of the dielectric plate 12 and 1a" the assembly may be readily pulled from its wedge-shaped passageway. The herein described generator has an extremely high capacity for its size and because of the construction and arrangement of its parts may be produced at a low and reasonable cost. 'By reason .of the fact that the sections of the high tension electrodes are in a sealed condition fiash or arc-overs and reaching arcs are avoided and the generator will last an extremely long time Without repair or replacement of any of the parts. Furthermore, the generator operates to produce pure or unadulterated ozone.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having'thus described the invention what I claim asnew and desire to secure by Letters Patent is:

1. An ozone generating unit comprising in combination a high tension electrode, a grounded electrode spaced from the high tension electrode, a dielectric plate positioned against the inner face of the high tension electrode and in such manner as to form between it and the grounded electrode a combined air passage and spark gap and having the margins thereof extending outwardly of the margins of the high tension electrode, means for supplying high voltagecurrent to the high tension electrode for discharge through the dielectric plate to the grounded electrode in order to form ozone in said. combined air passage and spark gap, and separately formed strips of insulating material surrounding the margins'of the high tension electrode and fitting flatly against and stuck to the adjoining face portions of the margins of the dielectric plate for preventing a flash-over of the current around v said last mentioned margins.

2. An ozone generating unit comprising in combination a pair of I laterally spaced flat grounded electrodes, a fiat high tension electrode located substantially equidistantly between the two grounded electrodes, a pair of fiat dielectric plates positioned against the side faces of the high tension electrode in such manner as to form between the high tension electrode and the two grounded electrodes a pair of combined air passages and spark gaps and having the margins thereof projecting outwardly of the margins of the high tension electrode, means for supplying high voltage current to the high tension electrode for discharge through the dielectric plates and across the combined air passages and spark gaps to the grounded electrodesfor ozone-form ing purposes, and separately formed flat strips of insulating tape extending around and forming a box formation about the margins of the high tension electrode and flatly against the inner or opposed face portions of the margins of the dielectric plates for preventing aflash-over of the current around said last mentioned margins] 3. An ozone generating unit comprising in combination a pair of laterally spaced fiat grounded electrodes, a flat high tension electrode located substantially equidistantly between the two grounded electrodes; a pair of fiat dielectric plates positioned against the side faces of the high tension electrode in such manner as to form between the high tension electrode and the two grounded electrodes 'a pair of combined air pas sages and spark gaps and having the margins thereof projecting outwardly of the margins o'f the high tension electrode, means for supplying high voltage current to the high tension electrode for discharge through the dielectric plates and across the combined air passages and spark gaps to the grounded electrodes for ozone-forming purposes, and separately formed flat strips of insulating tape surrounding the margins of the high tension electrode and having the side faces thereof fitting flatly against and stuck to the inner'or opposed face portions of the margins ofthe dielectric plates and serving to seal the high tension electrode and to prevent a flashover of the current around the margins of the dielectric plates.

4. A high tension electrode for use in an ozone generator" comprising a flat metallic plate, a pair of fiat dielectric plates fitting directly against the side faces of the metallic-plate and having the margins thereof extending beyond the margins of said metallic plate, and fiat strips of insulating tape surrounding the margins of the metallic plate and having the side faces thereof fitting flatly against and stuck to the inner faces of the margins" of the dielectric plates so as to form a substantially airtight seal around said metallic plate.

5. In an ozone generator, the combination of a plurality of disk-shaped grounded-electrodes positioned in coaxial and spaced relation and the grounded electrodes and having between 'them and said grounded electrodes combined 'air passages and spark gaps leading between the two chambers, means for supplying air under pressure to one of the chambers for passage into.

said air passages and spark gaps, and means for supplying high voltage current to the high tension electrodes for discharge to the grounded electrodes in order to form ozone in the combined .air passages and spark gaps;

.6. In an ozone generator, the combination of a plurality of disk-shaped grounded electrodes positioned in coaxial and spaced relation and have ing aligned apertures in the central portions thereof forming an elongated ozone receiving chamber, a plurality of ring-shaped high tension electrodes positioned substantially equidistantly between and in alternate relation with the grounded electrodes and having between them and said grounded electrodes combined airpassages and spark gaps leading to the chamber,

means for flowing air under pressure through said combined air passages and spark gaps toward the chamber, and means for supplying high voltage current to the high tension electrodes for discharge to the grounded electrodes in order to form ozone in said combined air passages and spark gaps.

7. In an ozone generator, the combination of a plurality of disk-shaped grounded electrodes positioned in coaxial and spaced relation having aligned apertures in the central portions thereof forming an elongated ozone receiving chamber, a plurality of ring-shaped high tension electrodes positioned substantially equidistantly between and in alternate relation with the grounded electrodes, means comprising dielectric plates forming combined air passages and spark gaps between the high tension and grounded electrodes and leading to the chamber, means for flowing air under pressure through said combined air passages and spark gaps toward the chamber, and means for supplying high voltage current to the high tension electrodes for discharge through the grounded electrodes in order to form ozone in said combined air passages and spark gaps.

8. In an ozone generator, the combination of a plurality of disk-shaped grounded electrodes positioned in coaxial and spaced relation and having aligned apertures in the central portions thereof forming an elongated ozone receiving chamber, a plurality of ring-shaped high tension electrodes positioned substantially equidistantly between and in alternate relation with the grounded electrodes and having between them and said grounded electrodes combined air passages and spark gaps leading to the chamber, means for flowing air under pressure through said combined air passages and spark gaps toward the chamber, and means comprising a rod extending through the ozone receiving chamber and conductors leading from the rod to the high tension electrodes for supplying high voltage current to the latter for discharge to the grounded electrodes in order to form ozone from the air in said combined air passages and spark gaps.

9. In an ozone generator, the combination of a plurality of disk-shaped grounded electrodes positioned in coaxial and spaced relation and having aligned apertures in the central portions thereof forming a chamber, a plurality of ringshaped high tension electrodes positioned substantially equidistantly between and in alternate relation with the grounded electrodes and formed individually of independently removable sectorlike sections, sector-like dielectric plates associated and removable with said sections and forming combined air passages and spark gaps between the high tension and grounded electrodes and leading to the chamber, and means for supplying high voltage current to the high tension electrode for discharge to the grounded electrodes in order to form ozone in said combined air passages and spark gaps.

10. In an ozone generator, the combination of a plurality of ring-shaped grounded electrodes positioned in coaxial and spaced relation, insulating pieces positioned between and extending radially of the grounded electrodes and forming Wedge-shaped passageways between the latter, sector-like high tension electrodes disposed in said passageways and spaced substantially equidistantly from the grounded electrodes, and means for supplying high voltage current to said high tension electrodes.

11. In an ozone generator, the combination of a plurality of ring-shaped grounded electrodes positioned in coaxial and spaced relation, insulating pieces positioned between and extending radially of the grounded electrodes and forming wedge-shaped passageways between the latter, sector-like high tension electrodes disposed in said passageways and spaced substantially equidistantly from the grounded electrodes, pairs of sector-shaped laterally spaced dielectric plates disposed in the passageways between the high tension and grounded electrodes and forming combined air passages and spark gaps, and means for supplying high voltage current to the high tension electrodes for discharge through the dielectric plates to the grounded electrodes in order to form ozone in said combined air passages and spark gaps.

12. In an ozone generator, the combination of a plurality of hollow ring-shaped grounded electrodes positioned in coaxial and spaced relation, a plurality of ring-shaped high tension electrodes positioned substantially equidistantly between and in alternate relation with the grounded electrodes and having combined air passages and spark gaps between them and the grounded electrodes, means for supplying high voltage current to the high tension electrodes for discharge to the grounded electrodes in order to form ozone in said combined air passages and spark gaps, and means for circulating a cooling medium through the grounded electrodes comprising tubes extending transversely through the latter.

13. A high tension unit adapted primarily for use in the production of ozone and comprising a thin substantially imperforate electrode having means for receiving high voltage current, and a pair of separately formed dielectric plates fitting flatly against the side faces of the electrode and having the margins thereof extending outwardly an appreciable distance beyond the edges of said electrode and embodying insulating means between them extending inwardly from their edges to substantially the edges of said electrode, said last mentioned means being of sufiicient insulating strength to withstand passage of the high voltage current therethrough and constituting around the edges of said electrode an insulated seal of greater width than the thickness of either di'electrc plate and serving to prevent a flash-over of current around the edges of the plates and the accumulation of moisture on the inner faces of said plates.

14. A high tension unit adapted primarily for use in the production of ozone and comprising a thin flat imperforate electrode having means for receiving high voltage current, and a pair of separately formed dielectric plates of uniform thickness throughout fitting flatly against the side faces of said electrode and having the margins thereof extending outwardly an appreciable distance beyond the edges of said electrode and embodying between them separately formed insulating means extending inwardly from their edges to substantially the edges of said electrode, said last mentioned means being of suflicient insulating strength to withstand passage of the high voltage current therethrough and constituting around the edges of said electrode an insulated seal of greater width than the thickness of either dielectric plate and serving to prevent a flash-- over of current around the edges of the plates and the accumulation of moisture on the inner faces of said plates.

JAMES M. DAILY. 

